Synthesis of CeO₂-SiO₂ Composite Nanoparticles by Coprecipitation Method and Dispersion Stability of their Suspension

Abstract:

A series of CeO₂-SiO₂ composite nanoparticles with different cerium and silica (Ce/Si) mole ratios were synthesized via a coprecipitation method using cerium nitrate, tetraethylorthosilicate and ammonia as raw materials. X-ray diffraction (XRD), fourier transform infrared spectrology (FT-IR), thermogravimetry-differential scanning calorimetry (TG/DSC), transmission electron microscopy (TEM) and energy dispersive analysis of X-ray (EDAX) were used to characterize the CeO₂-SiO₂ nanoparticles. With the increase of CeO₂ content, the crystal of CeO₂ grew up gradually and the average crystallite size of the CeO₂ decreased. There are Ce-O-Si bonds in the CeO₂-SiO₂ composite nanoparticles. The particle size of the CeO₂-SiO₂ composite nanoparticles with a Ce/Si mole ratio of 1 is about 20–30 nm. The dispersion stability of the CeO₂-SiO₂ composite nanoparticles with a Ce/Si mole ratio of 1 was studied. It was found that cationic and nonionic surfactant could obviously affect the dispersion stability of suspension, but not the anion surfactant. A suspension with CeO₂-SiO₂ composite nanoparticles at 0.1 wt% was added in 0.1 g/L cationic surfactant CTAB, and its pH value was adjusted within the range of 10-10.5. In this condition, the stable suspension without sedimentation time was successfully obtained.

• Periodical: Advanced Materials Research (Volume 1118)
• Pages: 47-54
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1118.47
• Online since: July 2015
• Authors: Xiao Lan Song*, Kang Lin, Hai Long Duan, Yan Xiao, Huang Zhuang, Hua Wei Zhang, Nan Jiang
• Keywords: CeO₂-SiO₂, Composite Nanoparticles, Coprecipitation Method, Dispersion Stability

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